Dynamic flexural performance and failure mechanisms of AR-glass TRM under coupled elevated temperature and low-velocity impact

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-03 DOI:10.1016/j.conbuildmat.2025.143824

Anling Li , Yongbo Shao , Dorin Radu , Marijana Hadzima-Nyarko , Deju Zhu

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引用次数: 0

Abstract

This study investigates the dynamic flexural behavior and failure mechanisms of alkali-resistant (AR) glass textile-reinforced mortar (TRM) under the combined influence of elevated temperature and low-velocity impact loading. Specimens were exposed to target temperatures (100℃, 200℃, 300℃, and 400℃) and subsequently tested under three-point impact bending at varying velocities. Results reveal that moderate heating (≤200℃) may retain or slightly enhance flexural ductility due to matrix densification and coating softening. However, the critical transition spanning 200–300℃ was marked by a sharp decline in ultimate stress and toughness, concomitant with a failure-mode shift from fiber pull-out to fiber rupture. Importantly, degradation was more severe under real-time high-temperature impact compared to post-heating tests, due to the absence of bond recovery and accelerated interfacial weakening. Quantitative analysis confirmed strong negative correlations between mean crack spacing and both ultimate stress and toughness, highlighting the role of crack morphology in energy dissipation. This mechanism explains the brittle transition of TRM under fire–impact coupling and informs resilient composite design.

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ar玻璃TRM在高温低速耦合冲击下的动态弯曲性能及破坏机理

研究了高温和低速冲击载荷联合作用下耐碱玻璃纤维增强砂浆（TRM）的动态弯曲行为和破坏机制。将试件置于目标温度（100℃、200℃、300℃、400℃）下，并在不同速度下进行三点冲击弯曲试验。结果表明，适度加热（≤200℃）可使基体致密化和涂层软化，从而保持或略微提高材料的抗弯延性。然而，在200-300℃的临界过渡阶段，纤维的极限应力和韧性急剧下降，并伴随着从纤维拔出到纤维断裂的破坏模式转变。重要的是，与加热后的测试相比，由于没有键恢复和加速界面弱化，实时高温冲击下的降解更为严重。定量分析证实，平均裂纹间距与极限应力和韧性之间存在较强的负相关关系，突出了裂纹形态在能量耗散中的作用。该机理解释了火-冲击耦合作用下TRM的脆性转变，为弹性复合材料的设计提供了理论依据。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.